From: bors <bors@rust-lang.org>
Date: Tue, 12 Apr 2016 15:14:33 +0000 (-0700)
Subject: Auto merge of #2562 - smaximov:doc-add-env-vars, r=alexcrichton
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Auto merge of #2562 - smaximov:doc-add-env-vars, r=alexcrichton

Document env vars introduced in PR #2523 to the docs

Document environment variables introduced in #2523 (`CARGO_PKG_NAME`, `CARGO_PKG_DESCRIPTION`, `CARGO_PKG_HOMEPAGE`).
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88e30811d3f85a881452d22a852714c7e440ddad